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Micromachines 2012, 3(1), 1-9; doi:10.3390/mi3010001

Displacement Pumping of Liquids Radially Inward on Centrifugal Microfluidic Platforms in Motion

Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A 2K6, Canada
* Author to whom correspondence should be addressed.
Received: 7 November 2011 / Revised: 12 December 2011 / Accepted: 15 December 2011 / Published: 22 December 2011
(This article belongs to the Special Issue Micro Flow Controllers)
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We describe two novel centrifugal microfluidic platform designs that enable passive pumping of liquids radially inward while the platform is in motion. The first design uses an immiscible liquid to displace an aqueous solution back towards the center of the platform, while the second design uses an arbitrary pumping liquid with a volume of air between it and the solution being pumped. Both designs demonstrated the ability to effectively pump 55% to 60% of the solution radially inward at rotational frequencies as low as 400 rpm (6.7 Hz) to 700 rpm (11.7 Hz). The pumping operations reached completion within 120 s and 400 s respectively. These platform designs for passive pumping of liquids do not require moving parts or complex fabrication techniques. They offer great potential for increasing the number of sequential operations that can be performed on centrifugal microfluidic platforms, thereby reducing a fundamental limitation often associated with these platforms.
Keywords: centrifugal; microfluidics; displacement; pumping; radially inward centrifugal; microfluidics; displacement; pumping; radially inward
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kong, M.C.R.; Bouchard, A.P.; Salin, E.D. Displacement Pumping of Liquids Radially Inward on Centrifugal Microfluidic Platforms in Motion. Micromachines 2012, 3, 1-9.

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